| DICOM PS3.3 2024e - Information Object Definitions |
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Table C.8-38 specifies the Attributes of the RT Image Module, which describe RT-specific characteristics of a projection image. The image described by these Attributes must be a radiotherapy image acquired or calculated using a conical imaging geometry.
Table C.8-38. RT Image Module Attributes
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Number of samples (planes) in this image. See Section C.8.8.2.6.1 for specialization. |
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Specifies the intended interpretation of the pixel data. See Section C.8.8.2.6.2 for specialization. |
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Number of bits allocated for each pixel sample. Each sample shall have the same number of bits allocated. See Section C.8.8.2.6.3 for specialization. |
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Number of bits stored for each pixel sample. Each sample shall have the same number of bits stored. See Section C.8.8.2.6.4 for specialization. |
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Most significant bit for each pixel sample. Each sample shall have the same high bit. See Section C.8.8.2.6.5 for specialization. |
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Data representation of the pixel samples. Each sample shall have the same pixel representation. See Section C.8.8.2.6.6 for specialization. |
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The relationship between the Pixel sample values and the X-Ray beam intensity. |
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The sign of the relationship between the Pixel sample values stored in Pixel Data (7FE0,0010) and the X-Ray beam intensity. Required if Pixel Intensity Relationship (0028,1040) is present. Enumerated Values: See Section C.8.11.3.1.2 for further explanation. |
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Image identification characteristics (see Section C.7.6.1.1.2). |
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Describes the origin of the parameter values reported in the image. Required if Value 3 of Image Type (0008,0008) is SIMULATOR or PORTAL. |
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Describes whether or not image plane is normal to beam axis. |
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Position in (x,y,z) coordinates of origin of IEC X-RAY IMAGE RECEPTOR System in the IEC GANTRY coordinate system (mm). See Note 2. |
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X-Ray Image Receptor Angle i.e., orientation of IEC X-RAY IMAGE RECEPTOR coordinate system with respect to IEC GANTRY coordinate system (degrees). See Section C.8.8.2.2. |
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The direction cosines of the first row and the first column with respect to the IEC X-RAY IMAGE RECEPTOR coordinate system. Required if RT Image Plane (3002,000C) is NON_NORMAL. May be present otherwise. |
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Physical distance (in mm) between the center of each image pixel, specified by a numeric pair - adjacent row spacing (delimiter) adjacent column spacing. See Section C.8.8.2.3 and Section 10.7.1.3 for further explanation. |
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The x and y coordinates (in mm) of the upper left hand corner of the image, in the IEC X-RAY IMAGE RECEPTOR coordinate system. This is the center of the first pixel transmitted. See Section C.8.8.2.7. |
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User-defined name identifying radiation machine used in acquiring or computing image (i.e., name of conventional simulator, electron accelerator, X-Ray device, or machine modeled when calculating DRR). |
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Radiation source to Gantry rotation axis distance of radiation machine used in acquiring or computing image (mm). |
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Source to Patient surface distance (in mm) of radiation machine used in acquiring or computing image. |
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Distance from radiation machine source to image plane (in mm) along radiation beam axis. See Section C.8.8.2.3. |
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Whether the RT Beam Limiting Devices are specified by the Enhanced RT Beam Limiting Device Sequence (3008,00A1). |
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Enhanced RT Beam Limiting Device Descriptions. Required if Enhanced RT Beam Limiting Device Definition Flag (3008,00A3) is present and has the value YES. |
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>Include Table C.36.2.2.19-1 “RT Beam Limiting Device Definition Macro Attributes”. |
Device Type Code Sequence (3010,002E) within RT Accessory Device Identification Macro DCID 9540 “Movable Beam Limiting Device Type”. See Section C.8.8.14.17. |
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Source to reference object distance (in mm), as used for magnification calculation of RADIOGRAPH and SIMULATOR images. |
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Sequence of one Class/Instance pair describing RT Plan associated with image. |
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>Include Table 10-11 “SOP Instance Reference Macro Attributes” |
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Uniquely identifies the corresponding N-segment treatment beam specified by Beam Number (300A,00C0) within Beam Sequence (300A,00B0) in RT Beams Module within the RT Plan referenced in Referenced RT Plan Sequence (300C,0002) or the Ion Beam Sequence (300A,03A2) in the RT Ion Beams Module within the RT Ion Plan referenced in Referenced RT Plan Sequence (300C,0002). |
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Identifier of Fraction Group within RT Plan referenced in Referenced RT Plan Sequence (300C,0002). |
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Fraction Number of fraction during which image was acquired, within Fraction Group referenced by Referenced Fraction Group Number (300C,0022) within RT Plan referenced in Referenced RT Plan Sequence (300C,0002). See Section C.8.8.2.9. |
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Clinical Fraction Number |
(300A,0705) |
3 |
Identifier of the RT Treatment Fraction of the referenced RT Beam during which image was acquired. See Section C.8.8.21.4. |
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Cumulative Meterset Weight within Beam referenced by Referenced Beam Number (300C,0006) at which image acquisition starts. |
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Cumulative Meterset Weight within Beam referenced by Referenced Beam Number (300C,0006) at which image acquisition ends. |
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Sequence of Exposure parameter sets, corresponding to exposures used in generating the image. One or more Items are permitted in this Sequence. See Section C.8.8.2.4. |
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Identifies corresponding image frame in Multi-frame Image. Required if there is more than one Item in Exposure Sequence (3002,0030), and image is a Multi-frame Image. |
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Peak kilo voltage output (kV) of X-Ray generator used to acquire image. Required if Value 3 of Image Type (0008,0008) is PORTAL, SIMULATOR or RADIOGRAPH. |
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Sequence defining whether the primary fluence of the treatment beam uses a non-standard fluence-shaping. |
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Describes whether the fluence shaping is the standard mode for the beam or an alternate. |
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Identifier for the specific fluence-shaping mode. Required if Fluence Mode (3002,0051) has value NON_STANDARD. |
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Imaging device X-Ray Tube Current (mA). Required if Value 3 of Image Type (0008,0008) is SIMULATOR or RADIOGRAPH. May be present otherwise. |
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X-Ray Tube Current in mA. An average in the case of fluoroscopy (continuous radiation mode). |
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Time of X-Ray exposure (msec). Required if Value 3 of Image Type (0008,0008) is SIMULATOR or RADIOGRAPH. May be present otherwise. See Section C.8.8.2.8. |
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Duration of X-Ray exposure in msec. See Section C.8.8.2.8. |
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Treatment machine Meterset duration over which image has been acquired, specified in Monitor units (MU) or minutes as defined by Primary Dosimeter Unit (300A,00B3). Required if Value 3 of Image Type (0008,0008) is PORTAL. See Section C.8.8.2.8. |
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Positions of diaphragm jaw pairs (in mm) in IEC BEAM LIMITING DEVICE coordinate axis in the IEC order X1, X2, Y1, Y2. |
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Sequence of beam limiting device (collimator) jaw or leaf (element) positions for given exposure. Shall not be present if Enhanced RT Beam Limiting Device Definition Flag (3008,00A3) is present and has the value YES. |
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Type of beam limiting device (collimator). Enumerated Values: |
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Radiation source to beam limiting device (collimator) distance (mm). |
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Number of leaf (element) or jaw pairs (equal to 1 for standard beam limiting device jaws). |
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Boundaries (in mm) of beam limiting device (collimator) leaves (elements) in IEC BEAM LIMITING DEVICE coordinate axis appropriate to RT Beam Limiting Device Type (300A,00B8), i.e., X-axis for MLCY, Y-axis for MLCX. Contains N+1 values, where N is the Number of Leaf/Jaw Pairs (300A,00BC), starting from Leaf (Element) Pair 1. Required if RT Beam Limiting Device Type (300A,00B8) is MLCX or MLCY. May be present otherwise. |
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Positions of beam limiting device (collimator) leaf or jaw (element) pairs (in mm) in IEC BEAM LIMITING DEVICE coordinate axis appropriate to RT Beam Limiting Device Type (300A,00B8), e.g., X-axis for MLCX, Y-axis for MLCY). Contains 2N values, where N is the Number of Leaf/Jaw Pairs (300A,00BC), in IEC leaf (element) subscript order 101, 102, … 1N, 201, 202, … 2N. Required if Enhanced RT Beam Limiting Device Definition Flag (3008,00A3) is absent, or is present and has the value NO. |
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Sequence of beam limiting device (collimator) jaw or leaf (element) positions. Required if Enhanced RT Beam Limiting Device Definition Flag (3008,00A3) is present and has the value YES. |
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>>Include Table C.36.2.2.20-1 “RT Beam Limiting Device Opening Definition Macro Attributes” |
See Section C.8.8.14.17 “Enhanced RT Beam Limiting Device Sequence and Enhanced RT Beam Limiting Opening Sequence”. |
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Treatment machine or imaging device gantry angle, i.e., orientation of IEC GANTRY coordinate system with respect to IEC FIXED REFERENCE coordinate system (degrees). |
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Gantry Pitch Angle. i.e., the rotation of the IEC GANTRY coordinate system about the X-axis of the IEC GANTRY coordinate system (degrees). See Section C.8.8.25.6.5. |
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Treatment machine beam limiting device (collimator) angle, i.e., orientation of IEC BEAM LIMITING DEVICE coordinate system with respect to IEC GANTRY coordinate system (degrees). |
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Patient Support angle, i.e., orientation of IEC PATIENT SUPPORT coordinate system with respect to IEC FIXED REFERENCE coordinate system (degrees). |
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Table Top Pitch Angle, i.e., the rotation of the IEC TABLE TOP coordinate system about the X-axis of the IEC TABLE TOP coordinate system (degrees). See Section C.8.8.25.6.2. |
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Table Top Roll Angle, i.e., the rotation of the IEC TABLE TOP coordinate system about the Y-axis of the IEC TABLE TOP coordinate system (degrees). See Section C.8.8.25.6.2. |
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Table Top Vertical position in IEC TABLE TOP coordinate system (mm). |
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Table Top Longitudinal position in IEC TABLE TOP coordinate system (mm). |
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Table Top Lateral position in IEC TABLE TOP coordinate system (mm). |
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An identifier for the accessory intended to be read by a device such as a bar-code reader. |
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Defined Terms:
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Opening (in mm) of the applicator's aperture in IEC BEAM LIMITING DEVICE coordinate system. In case of square-shaped applicator contains the length of the sides of the square. In case of circular-shaped applicators, contains the diameter of the circular aperture. Required if Applicator Aperture Shape (300A,0432) is SYM_SQUARE or SYM_CIRCULAR. |
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Opening (in mm) of the applicator's aperture in IEC BEAM LIMITING DEVICE coordinate system in X-Direction. Required if Applicator Aperture Shape (300A,0432) is SYM_RECTANGLE. |
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Opening (in mm) of the applicator's aperture in IEC BEAM LIMITING DEVICE coordinate system in Y-Direction. Required if Applicator Aperture Shape (300A,0432) is SYM_RECTANGLE. |
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Radiation source to applicator mounting position distance (in mm) for current applicator. |
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Sequence of General Accessories associated with the beam producing this image. |
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Identification Number of the General Accessory. The value shall be unique within the Sequence. |
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Radiation source to general accessory distance (in mm) for current accessory. |
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Sequence of blocks associated with Beam. Required if Number of Blocks (300A,00F0) is non-zero. |
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An identifier for the Tray intended to be read by a device such as a bar-code reader. |
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An identifier for the Block intended to be read by a device such as a bar-code reader. |
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Radiation Source to attachment edge of block tray assembly (mm). |
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Indicates on which side of the Block Tray the block is mounted. |
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Identification Number of the Block. The value of Block Number (300A,00FC) shall be unique within the Beam in which it is created. |
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User-supplied identifier for material used to manufacture Block. |
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Physical thickness of block (in mm) parallel to radiation beam axis. |
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A data stream of (x,y) pairs that comprise the block edge. The number of pairs shall be equal to Block Number of Points (300A,0104), and the vertices shall be interpreted as a closed polygon. Coordinates are projected onto the machine isocentric plane in the IEC BEAM LIMITING DEVICE coordinate system (mm). |
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A Sequence of data describing the fluence map Attributes for a radiotherapy beam. Only a single Item shall be included in this Sequence. Required if the third value of Image Type (0008,0008) is FLUENCE. |
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The Meterset corresponding with a fluence map cell value of 1.0 expressed in units specified by Primary Dosimeter Units (300A,00B3). This is the Meterset value used for treatment, not the Meterset used to expose the film as defined by Meterset Exposure (3002,0032). |
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Treatment machine or imaging device gantry angle, i.e., orientation of IEC GANTRY coordinate system with respect to IEC FIXED REFERENCE coordinate system (degrees). |
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Gantry Pitch Angle. i.e., the rotation of the IEC GANTRY coordinate system about the X-axis of the IEC GANTRY coordinate system (degrees). See Section C.8.8.25.6.5. |
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Treatment machine beam limiting device (collimator) angle, i.e., orientation of IEC BEAM LIMITING DEVICE coordinate system with respect to IEC GANTRY coordinate system (degrees). |
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Patient Support angle, i.e., orientation of IEC PATIENT SUPPORT coordinate system with respect to IEC FIXED REFERENCE coordinate system (degrees). |
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Distance (positive) from the IEC PATIENT SUPPORT vertical axis to the IEC TABLE TOP ECCENTRIC vertical axis (mm). |
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Table Top (non-isocentric) angle, i.e., orientation of IEC TABLE TOP ECCENTRIC coordinate system with respect to IEC PATIENT SUPPORT system (degrees). |
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Table Top Pitch Angle, i.e., the rotation of the IEC TABLE TOP coordinate system about the X-axis of the IEC TABLE TOP coordinate system (degrees). See Section C.8.8.25.6.2. |
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Table Top Roll Angle, i.e., the rotation of the IEC TABLE TOP coordinate system about the Y-axis of the IEC TABLE TOP coordinate system (degrees). See Section C.8.8.25.6.2. |
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Table Top Vertical position in IEC TABLE TOP coordinate system (mm). |
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Table Top Longitudinal position in IEC TABLE TOP coordinate system (mm). |
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Table Top Lateral position in IEC TABLE TOP coordinate system (mm). |
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Isocenter coordinates (x,y,z), in mm. Specifies the location of the machine isocenter in the Patient-Based Coordinate System associated with the Frame of Reference. It allows transformation from the equipment-based IEC coordinate system to the Patient-Based Coordinate System. |
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Patient position descriptor relative to the patient support device. Required if Isocenter Position (300A,012C) is present. May be present otherwise. See Section C.8.8.12.1.2 for Defined Terms and further explanation. NoteThe orientation of the patient relative to the patient support device is denoted in the same manner as in the RT Patient Setup Module. It defines the relation of the DICOM Patient-Based Coordinate System identified by the Frame of Reference Module of the RT Image to the IEC coordinate system and together with Isocenter Position (300A,012C) allows the RT Image to be placed into the Patient Frame of Reference. It also allows a system using an RT Image to verify that the patient is setup in a similar position relative to the patient support device. |
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Time of X-Ray exposure (msec). Required if Value 3 of Image Type (0008,0008) is SIMULATOR or RADIOGRAPH. May be present otherwise. See Section C.8.8.2.8. |
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Duration of X-Ray exposure in msec. See Section C.8.8.2.8. |
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Treatment machine Meterset duration over which image has been acquired, specified in Monitor units (MU) or minutes as defined by Primary Dosimeter Unit (300A,00B3). See Section C.8.8.2.8. |
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The numeric beam data parameters recorded with the RT Image correspond to the parameters as they were known at the time the image was created or taken. The parameters may or may not correspond to an actual RT Plan Instance that is created for a patient. If the Reported Values Origin (3002,000A) has an Enumerated Value of OPERATOR or ACTUAL and there is an RT Plan reference present, the numeric beam data parameters may or may not be the same in the two objects.
The Z coordinate of the X-Ray Image Receptor Translation (3002,000D) will be equal to the Radiation Machine SAD (3002,0022) minus the RT Image SID (3002,0026). If the image receptor is further from the beam source than the machine isocenter, the Z coordinate will be negative (see [IEC 61217]).
In either multiple exposure Multi-frame Images or cine images, only the Attributes inside Exposure Sequence (3002,0030) shall differ between frames. For example, Attributes such as beam limiting device (collimator) leaf (element) positions and block information may change, whereas Attributes such as gantry and beam limiting device (collimator) angle shall not change.
| DICOM PS3.3 2024e - Information Object Definitions |
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